This is what 2A Armament says:

 

 

This combination kit features the patent-pending ultralight, precision machined 2A Armament titanium AR 22LR bolt carrier and the lightweight AR 22LR fluted barrel. This combination allows any standard AR15 upper to be converted to a dedicated 22LR upper receiver, which makes it perfect for those that are wanting to build a lightweight dedicated AR 22LR upper.  Combined these items weigh in at 20 oz.  Requires 2A Armament AR 22LR magazine (or compatible magazines).

Features:

Bolt Carrier

    Grade 5 6AL-4V Titanium Bolt
    Stainless steel collar, ejector, extractor, firing pin
    Synthetic polymer buffer
    weight 7.0 oz

Barrel

    16.5"
    7075 Aluminum
    1:16 twist
    anodized black
    1/2-28 threaded
    thread protector included
    weight 13 oz

PATENT PENDING - Made in the Great State of Idaho

New 22LR Bolt Carrier + Barrel Kit

SKU: 2A-22BCGBAR-1
$399.00 Regular Price
$379.05Sale Price

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